I own an XBox 360 and admit I spend a lot of time on the types of games that work well on that platform (mostly cause I'm sick of screwing with messed up PC DRM).
With that said, there's no way to get a Homeworld type of experience on a console, to name one measly example out of 1000s. RPGs have a notably different flavor on consoles, and it's not just Japanese vs. American either. I don't hate consoles, I find a good console is a great complement to my gaming, but PCs are more customizable, I'm more at home there. My console feels like my Cuisinart blender or coffee maker to me, it's an appliance that does one thing. On my PC, I not only game, I do tons of things.
And besides, with the combo of the two you can do fun things, like stream movies via UPnP at HD resolutions from my PC to 360 and spit out onto my HDTV:)